Faucet leaking is a terrable thing in the home , if water flood your home , maybe cause your house funiture in the water . i can not image what's happen for your wooden floor .

How does faucet leak ? 

For new faucet, loose fitting of the system part. some part maybe remove out from position. such as O ring for cartridge, oulet tube,inlet tube , connector hose etc. if the water leaking from cartrideg position, that meaning cartridge O-ring broken or remove from position. if leaking water from undertop that the hose loosen or O-ring broken. some time outlet tube still flow water even if you close , maybe the cartridge damage , please replace a new one